/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.types.inference;

import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.table.catalog.DataTypeFactory;
import org.apache.flink.table.types.DataType;

import javax.annotation.Nullable;

/** Transforms one data type to another. */
@PublicEvolving
public interface TypeTransformation {

    /** Transforms the given data type to a different data type. */
    DataType transform(DataType typeToTransform);

    /**
     * Transforms the given data type to a different data type.
     *
     * <p>This method provides a {@link DataTypeFactory} if available.
     */
    default DataType transform(@Nullable DataTypeFactory factory, DataType typeToTransform) {
        return transform(typeToTransform);
    }
}
